While Colegio Base attains remarkable results in all aspects of academic excellence as a Spanish school and through the Spanish language, in wishing to provide pupils with an essential preparation for the future, one of the prinicipal objectives of the school is that of ensuring that each pupil reaches a high level of proficiency in one or more foreign languages. English is the main target language, French or German the second language offered. The immersion system in foreign language acquisition used at the school means that all pupils on leaving at pre-university age can communicate with a high level of fluency in English and other languages and so gain a head-start for their future work and studies.

Colegio Base was a pioneer school in Spain in the introduction of the concept of Immersion English in the general syllabus in its Primary section over 20 years ago.
The English Dept of the school adapted the model of immersion from experiences in other countries, (in particular from the immersion in French for English-speaking school-children in Canada) and designed a syllabus that aimed to maximise an input in English within the context of a Spanish school by introducing content-based learning.

Content-based learning was proved as the most efficient means of aquiring a language through using the target language as the language of instruction in subjects in the curriculum. Therefore the school designed a programme whereby a high percentage of the pupils´ timetable of lessons was to be given in this foreign language, scaled according to the general educational needs at the Infant and Primary level. This model and the associated methodology has been tried and refined over time and is now thoroughly integrated and consolidated in the educational system of the school. The result is a bilingual system of learning and instruction throughout Primary.

At the present time the English Department of the school is composed of 21 qualified English teachers, the majority of whom are native-English speakers, while the remainder are bilingual teachers who have lived abroad and studied at English-speaking universities.